This at home professional teeth whitening kit is amazing. I have been trying it for several weeks now, didn't really need that long to notice a difference. It is easy to use, easy to follow directions, and super easy to administer. I could tell the difference after one week but I wanted to make sure so I continued for several more weeks, there are only 50 treatments so I used them sparingly, I wanted these to last and sure enough, you don't even have to use it every day, it is natural and comes with tray and gel pen that utilizes activated charcoal.